Figure 2 | Scientific Reports

Figure 2

From: Single-Shot Readout Performance of Two Heterojunction-Bipolar-Transistor Amplification Circuits at Millikelvin Temperatures

Figure 2

(a) Schematic diagram of CB-HBT readout circuit including room temperature amplification and biasing. The SET is represented by the larger, upper orange circle, and the QD is represented by the smaller, lower orange circle. (b) Image of the PCB which shows the Si-MOS device and HBT mounted close together. (c) DC current gain and sensitivity vs. power dissipated by the CB-HBT. (d) Normalized CB peak for different CB-HBT gain/power biases. The blockaded regions of the CB peak do not reach zero current. (e) Noise referred to the collector of the CB-HBT at around 7 kHz for different powers. The measured noise is plotted as blue points. For comparison, the noise floor of the fridge (purple curve), base current shot noise (orange curve), and collector current shot noise (yellow curve) are plotted as well.

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